Hensy hovland



Nov. 9 Y I 1,605,952

H. HOVLAND v AUTOMATI coIN SERVICE TELEPI'ON' SYSTEM Filed May 1 1925 L EQ@ 1a-. m N L) A fL IIHI' 5 iIHI. R l |Hl fl T0 GROUP HUROTARY STEP GOMMO Patented Nov. 9, 1926.

UNITED stares Parent QFFCE-f HENRY `H0'VXA-HLW), OF FLUSHING, )FT YORK, ASSGNOR, BY ASSIGNMENTS, T0 WESTERN ELECTRICY'COMPNY, NCORPORATED, A CORPORATON OF NEW YORK.

AUTOMATIC COIN-SERVICE TELEHQNE SYSTEM.

Application iled May 1, 14925. Serial No. 27,168.

This invention relates to machine switching tele-phone exchange systems and more particularly to systems employing grounded signaling from substations and wherein substations are provided with coin boxes.

The object of this invention is to provide improved means for controlling the establishn'ient ot calls from prepayment lines and particularly to provide a selectcr circuit which will not permit a connection to be `built vup to a charge line under control` of the calling line dial unless a coin is `first deposited, and which will in that case route the connection automatically to an operator. Provision is v further vmade in the selector circuit so that if the calling station desires to call a Zero operator, lfor example, the. connection may be VVestablished without lirst depositing a coin. i y

In accordance with this invention all lines are reached via a certain group of selector switches, the. ordinary lines by way ot certain levels of said switches, and the 'free lines by certain other levels oi' said switches, each switch being provided with a. 'test relay which'is responsive to the deposit of `a coin at the calling substation on calls to an ordinary line.` rllhis relay, in responding, prepares the 'switch to extend the connection to a subsequent switch or switches of the train. ,Gn calls to free lines or Zero operators positions, an alternative circuit is provided for causing said test relay to respond and permit the establishment of a connection with a tree line. It for any reason the test relay does not respond, the selector switch advances to a setting 1Known as the 11th rotary step position where it remains until the calling subscriber disconnects.

' in the drawing, which comprises but a .single sheet, are disclosed a calling subscribers station, represented 1 and a typical called subscribers station at 2. The selector switch S1 is wiredin accordance with this invention and lfias'a'ccess to 'other se lector switches such as shown at S2 which in turn select a connector such asC. Shown on the lower part of the ligurel is a trunk to a Zero or special operators position which is under control ot selector switch S1. The new 'features of this invention will be more easily understood from the detailed description of the operation as follows:

A Vcall for which prepay/'ment is required.

When the receiver is removed i'roin the switchhook at subscribers station l, the brushes 5 and 6 of line V)finder will co`nnect with the terminals '3 and i in a manner well known to the art, and extend the connection through to selector switch S1. circuit is now closed fronibattery through the left winding of relay 245,'lower back contact ot relay 14 through 'the winding ot polarized relay 13, lower yback Contact ot relay 12, lower hack contact of relay y11, brush 6, 'terminal 4, subscribers station l, terminal. 3, brush 5, upper back Contact ot relay 1l, upper back contact of relay 12, upper inner'baclt contact of relay 14, lett back contact' of relay 37, right winding of relay 2li, upper normal contactof `11th rotary .step switch L19 through the windingof dial tone coil "to ground, thereby giving the calls ing' subscriber l adial tone. Polarized re lay 13 dees not operate at vthis time. Relay operated, closes an obvious circuit Vfor the operation of relay 25. The operation oi' re lay 25 'closes a circuit from ground on its f left-,front contact, conductors 6 9 and 55, outermost right backmcontact 0i relay `18 to battery through the winding of relay 19.` lielay 19 operated, locks over a circuit from battery through its winding, outer right Vfront Contact, conductors 48, 'and 69t0 ground on 4the left front contact of relay '25. Relay 19 operated, renders interru-pter 9 inoperative and closes an obvoius circuit tor the operation of relay 18 which locks under control of relay 711 and`v connects ground through retardation coil 17 and its outer left front contact Ioverconductor 53 .to Vthe. line finder LF thereby preventing the line iinder LF from releasing;

The 'dial at the cal-ling station 1 is now operated and released in accordance with the iirst digit of the number of the 'called line. As the dial returns to normal, the loop of the calling subscribers station 1 is interrupted, thus lproducing impulses in the irnpulse circuit which includes relay 24:. V'hen relay 24 releases, a circuitisconipleted from battery through the winding ot primary magnet 27, relay 26, right ront contact oli' relay 25, right back contact ot relay 24 to ground on the upper back contact of relay 14. Relays 25 and 26 are slow to release relays, therefore, they will remain operated during the dialing period. Each time primary magnet 27 operates, brushes 20, 21 and 22 are advanced one step until the number of impulses corresponding to the lirst digit have been received. During the iirst step of the selector switch, the oit-normal spring combination 59 is closed, closing a circuit for the operation of marginal relay 38, which may be traced 'from battery through the winding of relay 38, lower alternate contacts of ofl-normal spring 59, alternate contacts of relay 26 to ground at the let't front Contact of relay 25. Relay 38 locks under control ot' relay 14 over a circuit from ground on its upper outer back contact, conductor 67, right front contact ot relay 38, back Contact of magnet 36 and thence over the circuit hereinbetore traced through the Winding of relay 38 to battery.

When the dial at the calling subscribers station 1 returns to normal, relay 24 remains 'operated and relay 26 releases.V Relay 26 released, closes a circuit for operating secondary magnet V36 from battery through its winding, left winding of relay 37, lett front contact ot' relay 38, back contact of re lay 26 to ground on the left front contact of relay 25. The operation ot' secondary magnet 36 advances the brushes 20, 21 and 22 one step. Relay 37 operates in the above traced circuit and establishes a circuit from battery through the winding of relay 23, Winding ot marginal relay 68, front Contact oi relay'37, inner upper back contact ot relay 14, upper back contact of relay 12, upper back contact of relay 11, brush 5, terminal 3 to ground on spring 58, providing the calling subscriber has deposited the coin in the coin box. Relay 23 operates as `a test relay and cannot operate unless the ground condition caused by the coin 57 is found at the subscribers station 1. Marginal relay 68 cannot operate in this circuit because of the resistance of the coin vmagnet 74. Relay 23 operated, locks to lground over a circuit from battery through its winding, Winding of marginal relay 68, inner right front contact ot relay 23 to ground on the lett Jiront contact oit relay 25. The operation ot secondary magnet 36 opens the locking circuit hereinbefore traced for marginal relay 38. which releases, in turn opening the operating circuit for secondary magnet 36 and relay 37.

Brushes 20, 21 and 22 of the selector switch S1 are now resting on the terminals associated with the first trunk in the selected trunk level. We will assume that this trunk is busy, in which case ground is connected from the front contact of a relay similar to relay 29, thence to terminal 32, brush 22, inner lower back contact of relay 14, lower normal contact of 11th rotary step of oil'- normal switch 49, back contact of secondary magnet 36, lower alternate contact of oli'- normal switch 59 to battery through the winding of marginal relay 38. The operation of marginal relay 38 closes the circuit previously described for operating secondary magnet 36 and relay 37 in series. The operation of the secondary magnet 36 causes brushes 20, 21 and 22 to step one step in their secondary motion. This operation continues until an idle trunk is found, at which time no ground is iound on terminal 32 and secondary magnet 36 and relay 37 remain deenergized, closing a circuit for operating relay 14 in series with marginal relay 38 over a circuit from battery through the winding of relay 38, lower alternate contact of off-normal spring 59, bacli contact of magnet 36, lower normal contact of 11th rotary step switch 49 through the winding of relay 14, conductor 69 to ground on the lett front contact of relay 25. It Will be observed that as long as brush 22 was in contact with a busy trunk, a short circuit Was connected around the winding of relay 14 but When an idle trunk was found the short circuit was removed, permitting relay 14 to operate iu series with marginal relay 38. Relay 38 being marginal does not operate due to the high resistance of the Winding of relay 14. Relay 14 operates and opens the pulsing leads and closes the talking leads through the brushes 2O and 21. Relay 24 releases, in turn releasing relay 25, but the latter, being slow to release, remains oper ated long enough to allow sufficient time for theL operation of relay 28 over the sub- A r scribers loop which in turn operates relay 29. Relay 29 connects ground to terminal 32, thereby replacing the ground on the lett,

front contact of relay 25, which is later removed by the release of this relay.

Selector switch S2 is operated in the same manner as selector switch S1 With the eX- ception that the impulse relay 28 is used for setting the sWitch mechanism (not shown). Brushes 40, 41 and 42 of selector switch S2 are set on terminals 50, 51 and 52 of connector C and the. impulse relay 34 is operated in series with the calling subscribers loop and closes an obvious circuit for theV operation of slow to release relay 39 Which connects ground Jromits front contact to 70, brush to ground, through the right winding of relay 33, thereby operating relay' and reversing the direction of current flow in the loop circuit of subscribers station lavhich is'iii series Wit-h the impulse relay 34. Polarized relay 13 operates in this circuit, closing an obvious circuit for the operation ot relay 12. Relay 12 in turn closes an obvious circuit for the operation ot relay 16 which locks under control of relay 18 in a circuit from battery through its winding, lett tront contact, conductor 7, outer lett iront contact ot relay 18 through the retardation coil 17 to ground. The operation of relay 12 reverses the talking leads through its contacts.

When the receiver at substation 1 is replaced on the switchhook, relay 34 releases in turn releasing relay 39. The release of relay 39 removes ground from the test terminals 32 and 52, thereby permitting the release ot relays 14, 19 and 23. The release oit relay 14 opens the talking leads and closes a circuit 'for operating release magnet 35 vfrom battery through the Windii'ig ot the magnet, upper alternate contact of offnorinal spring 59, right back contact oit" relay 25, right back contact ot relay 24 to ground on the upper outer contact of relay 14. The operation of release magnet 35 restores the brushes of selector switch S1 to normal. The release ot relay 19 closes a circuit under the control of relay 18 trom battery through the Winding 'of relay 11, inner right front contact ot relay 1 8, inner right back Contact ot relay 19 to ground through interrupter 9. Relay 11 operated connects ground from the contact ot' coin mechanism 58 through terminal 3, brush 5, upper vliront contact of .relay 11, Winding ot relay 15, right 'front contact of relay 16 through lamp 43 to coin collect battery, lighting lamp 43 to indicate the condition of coin collect and operating the coin magnet 74 at station 1. rlhis circuit will operate relay 15 providing coin 57 is present. Relay 15 operated will provide a new holding circuit for relay 18 which is a slow to release relay so `that it will remain operated long enough to alloiv relay 15 to provide the substitute ground. When the brush of interrupter 9 encounters an insulated segment, relay 11 will release, removing the coin collect current trom the calling substation 1, thus permitting the coinniechanism 58 to restore and remove the ground previously provided under control of coin 57. lhen interrupter 9 again reaches a metal segment, relay 11 will reoperate again connecting coin collect current to the line. If the coin has been properly disposed of, theabsence ot the coin at calling `substation 1 prevents relay 15 'from operating and after anl interval otl time relay 18 `Will release, thereby removing ground from thesleeve of line finder LF, thereby permitting it to release in a Well known manner. When the l brush interrupter 9 once more reaches aninsulated segment, relay 11 Will release and the circuit is restored to normal.

Ordinary caZZ-no coi/ny deposited.

liet us assume that the calling substationV 1 initiates an Vordinary call, that is, a call` Under these circumstances, the circuitv functions in the manner above. described un til at the end ot the primary movement of selector switch S1 the test relay 23 has been connected to one conductor oit the calling line loop under the control rot relay 37.l No coin having been deposited at the calling substation 1, the contacts ot thecoin mechanisn'i 58 `will not be closed; therefore ground will not be connected to the circuit for relay N23, which will not `operate and a` circuit will be closed from ground o n the left'ront contact of relay 25, over the outer right back contact of relay 23, which Will be equivalent to a busy condition upon test terminaly 32, and the secondary magnet 36 and marginal relay 38 Will operate in the manner described above, and the brushes 20, 21 and 22 Willadvance until the last trunk in the group has been passed over andthe brushes are set in What is termed, the

eleventh rotary step position. In this position, a circuit will `be closed from ground through relay 73, lett back contact of relay 23, alternate contactfof eleventh rotary step spring combination 49 through the Winding `ot' relay 24,ilet'tV front contact of relay 37 to battery through the right non-inductive Winding ot relay 37. Relay 7 3 operates in this circuit, in turn operating vrelay 49 in an obvious circuit to ground on the back contact of relay 47 if the operator is lnot at the time engaged with another call from the. group ot'selectors and relay 4.7is not energized.v T he operation ot relay 49 closes a locking circuit for itself, closes the circuit ot group relay 47 to prevent other calls from being routed te the jack 54, and also` closes leads 62 and 63 through to leads 65 and G6 connected respectively to tip and ring springs of jack 54, and lights lamp 10 over an obvious circuit. Jaclr54 and-lamp lO appear before a special operator Who, uponV noting the lighting of lamp 10, inserts the plugl of an "operators telephone circuit (not shown)into jack 54, thereby `eX- tinguishin-g lamp 10 and connecting `herself directly through the subscriber at substation l. She then not-ities the calling subscriber of the failure to deposit a coin and advises that the call be made again in the proper manner.

00in deposit sini/dated with the operators position as previously described.

C'aZZs to free Zines.

It will be assumed that all free lines, such as trunks to zero operators positions, are reached through the 10th level of selector S1. It therefore, the subscriber at substation-1 desires such a free call, it is only necessary that he dial the digit l0 without depositing a coin. The selector S1 is advanced in the manner described `by the primary magnet 27 to position the brushes 20, 2l and 22 opposite the tenth level of bank terminals. In this position trunk hunting is started and since the tenth level contacts 46 are now closed, relay 23 operates in a circuit from battery through the'windings of relays 23 and 68, resistance 72 which simulates the resistance oi a coin magnet, contacts 46, conductors 56, 48 and 55, to ground at the lei't contact of relay 25. l/Vith relay 23 operated the selector switch proceeds to hunt for and connect with an idle trunk in the tenth level in the manner previously described.

What is claimed is:

l. In a telephone system, calling lines having switch-controlling devices, means associated with each calling line operable to establish various circuit conditions thereon, called lines classified as charge lines, switching mechanism controllable by a calling line controlling device to build up a connection to any desired called line, an operators position, means under the control yof sai-d iirst means for preventing said switching mechanism from functioning in accordance with its normal mode ot operation to build up a connection, and means it'or completing a connection from one of said calling lines to said operators position should the switching mechanism be prevented from functioning in accordance with its normal mode of operation.

2. In a telephone system, calling lines, a

coin control device associated with each calling line, called lines classified as charge lines, switching mechanism controllable by a calling line to build up a connection to any desired called line, an operators position, means for preventing said switching mechanism from functioning in accordance with its normal mode of `operation to build up a connection if conditions are established on said calling line in simulation of the deposit of a coin in said coin device, and means for completing a connection from said calling line to said operators position should said switching mechanism be prevented from functioning in accordance with its normal mode of operation.

3, ln a telephone system, .calling lines, coin control devices associated with each calling line, called lines classiiied as charge lines, switching mechanism controllable b a calling line to build up a connection to any desired called line, an operators position, means for preventing said switching mechanism from functioning to extend a desired connection should the subscriber at one oi' said calling lines fail to deposit a coin in said control device and means or completing a connection from one of said calling lines to saidoperators position when the switching mechanism is prevented from functioning in accordance with its normal mode of operation.

4f.. In a. telephone system, calling lines, coin control devicesv associated therewith, called lines classified as charge lines, numerical and non-numerical switches operable in sequence under control of a calling line to build up a connection to any desired called line, the first numerical switch in this train having both a primary and a secon-dary movement, an operators position, means for causing said first numerical switch to move in a complete secondary movement without trunk hunting should the subscriber at one of said calling lines fail to deposit a coin in said coin device., and means at said first numerical switch elective at the end of the secondary movement for connecting said operators position to said calling line. t

5. In a telephone system, calling lines, a coin control vdevice associated with each line, called lines classified as charge lines, a train of automatic switches operable under control oi a calling line to build up a connection to any desired called line, one of the Aswitches in said 'train having both a primary and secondary movement, an operators position, means tor preventing said last mentioned switch from functioning in accordance with its normal secondary movement and to cause it to hunt to the end of the switch bank should the subscriber at one of said calling lines fail to deposit a coin in said coin device, and a relay in said last mentioned switch effective at the `end of the'y secondary movement thereof for connecting` said operators position to said calling line,

6. In a telephone system, calling lilies, a coin control device associated with each line, called lines, train oit automatic switches operable under control of a calling line to build up a connection to any desired called line, one of said switches having a primary movement to select groups of outgoing trunks and a secondary movementto select an idle trunk in a selected group, an operators position, a relay in said switch responsive to the deposit of a coin in the control device of a calling line to permit the normal secondary movement of said switch and effective to cause said switch to move in its secondary movement without trunk hunting to a position beyond the last trunk in the selected group if nocoin has been deposited, and means thereupon effective to connect the calling` line with said operators position.

7. In a telephone system, calling lines, a coin control device associated with each line,

called lines, a train of automat-ic switches operable under control of a calling line, to buil-d up a connection to any desired called line, one of said switches having a. primary movement to select groups of outgoing- `to a position beyond the last trunkv in the selected group if no coin has been deposited, means thereupon effective to connect the calling` line with said operators position, and means to prevent the concurrent connection of more than one calling line with said operators position.

In witness whereof, I hereunto subscribe my name this 22 day of April A. D., 1925.

HENRY HOVLANI). 

